Electrical fuse.



H. W. YOUNG.

ELECTRICAL FUSE.

APPLICATION FILED 1030.14, 1912.

1,067,568, PatentedJuly15,l913

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HARRY W. YOUNG, OF CHICAGO, ILLINOIS.

ELECTRICAL FUSE.

Application filed December 14, 1912.

To all whom 2'25 may concern:

Be it known that I, HARRY \V. YOUNG, a citizen of the United States, anda resident of the city of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inElectrical Fuses, of which the following is a specification.

My invention relates to improvements in electrical fuses and has for itsobject the provision of an electrical fuse so constructed as to preventthesul'istitution of a fuse member having a different capacity from thatfor which a fuse is designed and intended, thus insuring the propersupply of current, and at the same time preventing an oversupply.

The invention consists in the combinations and arrangements of partshereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings fo ming a part of this specification, and in which,

Figure 1 is a section, taken on line aa2 of F 1g. 2, of an electricalfuse embodylng' my invention, Fig. 2, a side view of the fuse, shownpartially in section, Fig. 3, a section taken on line yy of Fig. 1, andFig. 4, a section taken on line 2-2 of Fig. 2.

The preferred form of construction as illustrated in the drawingscomprises a suitable base plate 1 made of slate or other suitableinsulating material. Two insulating casings 2 made of porcelain, fiber,or other insulating material, are secured to said plate in any usualordesired manner. Each of the casings 2 is provided with a zig-zag slot3 in its top and with a vertical slot 4 in its inner face communicatingwith slot 3 as indicated. A metallic abutment member 5, made of sheetmetal in zig-Zag form, is arranged in each of the casings 2, with oneside thereof registering with the corresponding side of slot 3. Each ofthese abutment members 5 is carried by a plate 6 secured to the outerwall of easing 2 and provided with a horizontal extension 7 carrying abinding An opening 9 is provided in the outer end of each of the casings2 leading to binding screw 8 to permit of the insertion of a wire tomake contact with said binding screw, an opening 10 being provided incasing 2 for the accommodation of a screwdriver to be used in tighteningscrew 8 on Specification of Letters Patent.

Patented July 15, 1913.

Serial No. 736,842.

such a wire. A clamping plate 11, also made of sheet metal in zigzagform to fit abutment member 5 is also provided in each of the casings 2,and a clamping screw 12 is threaded in plate 11 and passes looselythrough abutment to serve as a means fordrawing said clamping platetoward said abutment to clamp a member therebetween. An opening 13 isprovided in the wall of each of the casings 2 for the accommodation of ascrew-driver in tightening screw 12. A

.of the zig-zag portions 15 is provided with a notch 16 to pass over thecorresponding screw 12 when inserted as explained above. By thisconstruction it will be observed that only a fuse member having its endsformed in a distinctive manner to fit the slots 3 and the sockets formedbetween clamping plates 11 and abutments 5 can be ci'nployed. Thus byproviding different styles of slots and clamping sockets for fuseholders of different capacities, and by providing fuse members with endsshaped to fit only the slots and sockets of the fuse holders for whichthey are designed, the insertion of a fuse member having a differentcapacity from that for which the fuse holder is designed and intended,is prevented. From this explanation it will be seen that only the fusemember which is adapted to carry the current for which a certain systemis designed and intended can be employed in conjunction with my improvedfuse holder, and that in this manner, it is rendered certain that thesystem in which this fuse holder is installed will always have asufiioient amount of current supplied thereto but never too much. Thiswill prevent the over-loading of the system either through design orignorance and thus add to the efficiency of the service.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into effect this is capable ofvariation and modification without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set-forth but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaims.

Having described my invention what I claim as new and desire to secureby Letters Patent is:

1. In a device of the class described, the combination with a terminalsocket having a distinctive shape, of a fusible member provided with aportion shaped to fit said socket; and an insulating casing for saidsocket having an entry slot of the same shape as said socket and adaptedto permit the insertion of said fusible member portion in said socket,substantially as described.

2. In a device of the class described, the combination with a terminalsocket having a distinctive shape, 01 a fusible member provided with aportion shaped to fit said socket, and an insulating casing for saidsocket having an entry slot. of the same shape as and registering withsaid socket, substantially as described.

3. In a device 01 the class described, the combination with terminalsockets having distinctive shapes, of fusible members provided withportions shaped to fit said sockets, and insulating casings for saidsockets having entry slots of the same shape as and registering withsaid sockets, substantially as described.

4. The combination with terminal sockets eachcomprising an abutment inzig-Zag form; a clamping plate in zig-zag form to fit each of saidabutments; a screw for drawing said plate toward said abutment; and aninsulating casing for each of said sockets having an entry slot of thesame shape as and registering with said socket, substantially asdescribed.

5. A device of the class described, compris ing a casing provided with aslot of distinctive shape; clamping means in said casing; and a fusemember shaped to pass through said slot, substantially as described.

6. A device of the class described, comprising a casing provided with aslot of Zigzag shape; clamping means in said casing, and a fuse membershaped to pass through said slot, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HARRY W. YUUNG. lVitnesses JOSHUA R. H. Por'rs, Hanan l LILLIS.

